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Leases - Components of Lease Costs (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2020
Lease Cost [Abstract]    
Operating lease cost $ 15.0 $ 28.8
Variable lease cost 4.7 8.5
Short-term lease cost $ 0.7 $ 1.8